Sand Sanctuary

After fighting Byrne, you must go to the Sand Sanctuary.

Go to the Sanctuary

Go to the Ocean Realm from the Tower of Spirits and ride the train into
the enclosed area in the desert. This is the Sand Sanctuary. Read the
sign here and wake up the two statues. You will learn that you need to
bomb the area where the gazes of the big statues meet. The sign is referring
to the big statues that you saw while riding around the rails. One of the
statues says that the layout of the Sand Sanctuary is the same as the
layout of the rails.

You need to go out and figure out which direction the large statues are
looking in, draw it on your map, then go back to the Sand Sanctuary and
bomb the spot that the statues are looking at.

The place that you should bomb is south of the Sand Sanctuary's spot on the
"map" and is to the left and down from the first intersection south of the
Sand Sanctuary's spot. When you find it, go downstairs.

Inside, you meet Rael. Perform the duet with him to add new Spirit Tracks.

To reach the Sand Temple, you first have to go to the Fire Realm using the
northbound rails to the east.

Rocktite

You will go through a tunnel and there will be a Rocktite in there that
will attack you. Fight it like you did before. This time, the Rocktite
will sometimes not have its mouth open. Hit one of the barrel bombs on the
wall when the Rocktite walks over it to make the Rocktite open its
mouth, then tap its eye like crazy to hit it.

Twisting Tunnels

The tunnels here warp you around to different points. Make a note of where
the tunnels send you so you can make it out to the path going back south
to the Ocean Realm. The direction that you go through the tunnels changes
where you go out, so be sure to try going through each tunnel both ways.
You might need to go into reverse as soon as you go through a tunnel in
order to go the right way.

After going through the arch into the Twisting Tunnels,
the correct way through is to go in reverse as soon as you emerge from
the first tunnel, go in reverse again after the second tunnel, then turn
right. You'll come out on the correct track.

Turrets

The third and final trial is that you have to kill all of the cannon
turrets that are mounted on the Sand Temple. Just hit their cannonballs
with yours, then shoot them once to kill them. Then the door to the
Sand Temple will open and you can go in.